理由1. 生态平衡

　　For maintaining a healthy ecological balance on this earth, animals, plants and marine species are as important as humans.

　　原因：每一种生命都重要Each organism on this earth has a unique place in food chain that helps contribute to the ecosystem in its own special way. (The eco-system is all about relationships between different organisms connected through food webs and food chains.)

　　对比：某个物种灭绝带来的后果 Even if a single wildlife species becomes extinct from the eco-system, it may disturb the whole food chain, ultimately (最终) leading to disastrous results.

　　举例：蜜蜂